# bohan1 - Name and serial number(box Last name EAS4200C...

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9-26-11 Name and serial number(box Last name): EAS4200C Aircraft Structures I IN TERM EXAM In this exam you may use only one 8.5x11” formula page. No calculators are allowed. Please sign a pledge that you have not violated any of the university honesty provisions with regards to this exam. _____________________ 1. (35%) The stress tensor is given as  100 030 002 MPa    a. Calculate the principal stresses and principal directions. Since there are no shear stresses in the x, y, z system it is the principal system. The principal stresses are the values on the diagonal, and the principal directions are x, y and z. b. Young’s modulus is 1 GPa, and Poisson’s ratio is zero. Calculate the Principal strains and the maximum engineering shear strain. The principal strains are in the same coordinate system as the principal stresses. So they are 1, 3 and 2 millistrains (MPa divided by GPa gives you 10 -3 . The maximum engineering shear strain can be calculated two ways. We

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## This note was uploaded on 03/27/2012 for the course EAS 4200C taught by Professor Kim during the Fall '09 term at University of Florida.

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bohan1 - Name and serial number(box Last name EAS4200C...

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